| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 27439 |
2017-07-12T15:20:27 Z |
gs14004 |
Relay (COI16_relay) |
C++14 |
|
0 ms |
3584 KB |
#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef long double llf;
typedef pair<int, int> pi;
struct pnt{
int first, second, idx;
};
lint ccw(pi a, pi b, pi c){
int dx1 = b.first - a.first;
int dy1 = b.second - a.second;
int dx2 = c.first - a.first;
int dy2 = c.second - a.second;
return 1ll * dx1 * dy2 - 1ll * dy1 * dx2;
}
lint ccw(pnt a, pnt b, pnt c){
int dx1 = b.first - a.first;
int dy1 = b.second - a.second;
int dx2 = c.first - a.first;
int dy2 = c.second - a.second;
return 1ll * dx1 * dy2 - 1ll * dy1 * dx2;
}
lint dist(pnt a, pnt b){
int dx = b.first - a.first;
int dy = b.second - a.second;
return 1ll * dx * dx + 1ll * dy * dy;
}
int n, m;
pi a[100005], b[100005];
void getch(vector<pnt> &v){
swap(v[0], *min_element(v.begin(), v.end(), [&](const pnt &a, const pnt &b){
return pi(a.first, a.second) < pi(b.first, b.second);
}));
sort(v.begin() + 1, v.end(), [&](const pnt &a, const pnt &b){
lint k = ccw(v[0], a, b);
if(k != 0) return k > 0;
return dist(v[0], a) < dist(v[0], b);
});
vector<pnt> h;
for(auto &i : v){
while(h.size() >= 2 && ccw(h[h.size() - 2], h.back(), i) <= 0){
h.pop_back();
}
h.push_back(i);
}
v = h;
}
int main(){
scanf("%d",&n);
for(int i=0; i<n; i++) scanf("%d %d",&a[i].first,&a[i].second);
scanf("%d",&m);
for(int i=0; i<m; i++) scanf("%d %d",&b[i].first,&b[i].second);
int lp = 0, rp = 0;
for(int i=1; i<m; i++){
if(ccw(a[0], b[lp], b[i]) < 0) lp = i;
if(ccw(a[0], b[rp], b[i]) > 0) rp = i;
}
vector<pnt> lv, rv;
vector<pi> mv;
for(int i=1; i<n; i++){
if(ccw(a[0], b[lp], a[i]) <= 0){
lv.push_back({a[i].first, a[i].second, -1});
}
else if(ccw(a[0], b[rp], a[i]) >= 0){
rv.push_back({a[i].first, a[i].second, -1});
}
else if(ccw(b[lp], b[rp], a[i]) <= 0){
mv.push_back(a[i]);
}
}
for(int i=0; i<m; i++){
lv.push_back({b[i].first, b[i].second, i});
rv.push_back({b[i].first, b[i].second, i});
}
getch(lv);
getch(rv);
int ps = -1, pe = -1;
pi ls, rs;
for(int i=0; i<lv.size(); i++){
if(lv[i].idx == -1 && lv[(i+1)%lv.size()].idx != -1){
ls = pi(lv[i].first, lv[i].second);
ps = lv[(i+1)%lv.size()].idx;
}
}
for(int i=0; i<rv.size(); i++){
if(rv[(i+1)%rv.size()].idx == -1 && rv[i].idx != -1){
rs = pi(rv[(i+1)%rv.size()].first, rv[(i+1)%rv.size()].second);
pe = rv[i].idx;
}
}
int ans = 0;
for(auto &i : mv){
bool okps = (ps == -1);
bool okpe = (pe == -1);
if(!okpe && ccw(a[0], b[pe], i) < 0 && ccw(rs, b[pe], i) < 0) okpe = 1;
if(!okps && ccw(a[0], b[ps], i) > 0 && ccw(ls, b[ps], i) > 0) okps = 1;
if(okps && okpe) ans++;
}
cout << n - ans - 1;
}
Compilation message
relay.cpp: In function 'int main()':
relay.cpp:87:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0; i<lv.size(); i++){
^
relay.cpp:93:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0; i<rv.size(); i++){
^
relay.cpp:57:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&n);
^
relay.cpp:58:64: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i=0; i<n; i++) scanf("%d %d",&a[i].first,&a[i].second);
^
relay.cpp:59:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&m);
^
relay.cpp:60:64: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i=0; i<m; i++) scanf("%d %d",&b[i].first,&b[i].second);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 2 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 3 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 4 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 5 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 6 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 7 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 8 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 9 |
Incorrect |
0 ms |
3584 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 2 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 3 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 4 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 5 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 6 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 7 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 8 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 9 |
Incorrect |
0 ms |
3584 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 2 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 3 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 4 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 5 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 6 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 7 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 8 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 9 |
Incorrect |
0 ms |
3584 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 2 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 3 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 4 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 5 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 6 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 7 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 8 |
Correct |
0 ms |
3584 KB |
Output is correct |
| 9 |
Incorrect |
0 ms |
3584 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
